Fig. 2
From: Single-shot on-chip spectral sensors based on photonic crystal slabs
Micro-spectrometer based on photonic-crystal (PC) slabs. a Schematic of the spectrometer, which consists of an array of PC slabs with different parameters. These slabs are integrated on top of a CMOS sensor array. b Optical image of the fabricated 6 × 6 PC structures. Three scanning electron microscopy (SEM) images of selected PC-slab structures marked by red, orange, and green frames, respectively, are shown on the side. c Measured transmission spectra T(λ) of the three structures in b. For each PC slab, the corresponding T(λ) is characterized using a monochromator
